because Oliver has recently taken to shouting really loudly, at cars and imaginery birds outside our windows and especially when he's in the lift. At first I thought he only did this when we are around, but yesterday he proved me wrong, as he was shouting and roaring even when a neighbour from the 6th floor was in the lift with us.
He has also taken many steps on his own over the weekend... as many as 15 at one time. YEAH!